The Celts of Europe herded animals, cultivated grains, and had a social structure divided into Rulers, Priests, and Commoners, just like the Medes, Persians, and Aryans. All four of these cultures were members of the Indo-European language group and all of them, with the exception of the Celts, formed large and powerful empires in the last millenium BC. What if they had bucked the trend and followed their linguistic brothers in establishing a Celtic Empire in Europe, let's say centered on Gaul.
How long do you think the Empire would last? What threats would it face, what would cause it to fall, and how would history develop during and after the Celtic Empire?
How long do you think the Empire would last? What threats would it face, what would cause it to fall, and how would history develop during and after the Celtic Empire?